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Network Security Engineer

Jane Street· Technology
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LondonFull-timePosted 3mo ago

About the role

Experienced Network Engineer to join the Network Security team to run, scale and continuously improve network security infrastructure through hands-on operations, design, and implementation. Focus on security appliances (firewalls, proxies), network segmentation, and collaboration with Cybersecurity and application teams.

Responsibilities

  • Work closely with Network Engineering on design and deployment of security perimeter and adjacent network infrastructure
  • Effectively manage and continuously evolve network segmentation, DMZ, and other aspects of network security
  • Evaluate and lab test new platforms for our network security infrastructure
  • Collaborate with Cybersecurity on detection and mitigation of threats and vulnerabilities on our network
  • Interface with application owners and traders to enable business workflows in a secure way
  • Proactively enhance support by improving network infrastructure observability, scripting, and communicating requirements to our software engineers
  • Improve our network security processes and documentation

Qualifications

  • 7+ years of experience operating and deploying network infrastructure
  • Experience with routing and network protocols (OSPF, BGP, PIM-SM)
  • Experience troubleshooting transport protocols (TCP/UDP)
  • Strong understanding of firewall hardware architecture, performance metrics, and its functional components
  • Experience with firewall configuration and troubleshooting
  • Understanding of Public Key Infrastructure and related technologies
  • Understanding of modern encryption techniques
  • High capacity to learn; flexible; able to context switch and prioritize
  • Ideally experience with overlay networks (EVPN, VxLAN)
  • A flexible and reliable team player who enjoys collaboration
  • Proficiency in a programming language is preferred but not required
  • Fluency in English is required

Skills

Required:Network infrastructure operationsRouting protocols (OSPF, BGP, PIM-SM)TCP/UDP troubleshootingFirewall hardware architecture and configurationPublic Key InfrastructureEncryption techniques
Nice to have:Overlay networks (EVPN, VXLAN)
Last updated Oct 25, 2026. Interested? Apply on the company site.

About Jane Street

SIX

Jane Street is a quantitative trading firm and liquidity provider with a unique focus on technology and collaborative problem solving.

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